unisonic technologies co., tba820m linear integrated circuit www.unisonic.com.tw 1 copyright ? 2005 unisonic technologies co., qw-r107-008.c 1.2w audio power amplifier ? description the utc tba820m is a monolithic integrated audio amplifier. it is designed for audio frequency class b amplifier. ? features *wide operating supply voltage: vcc=3~14v *medium output power p out =1.2w at vcc=9v,r l =8 , thd=10% *low quiescent circuit current: i q =4ma(type) *good ripple rejection. *minimum number of external parts required. dip-8 sop-8 *pb-free plating product number: tba820ml ? ordering information order number normal lead free plating package packing tba820m-s08-r tba820ml-s08-r sop-8 tape reel tba820m-s08-t tba820ml-s08-t sop-8 tube tba820m-d08-t tba820ml-d08-t dip-8 tube ? block diagram 1 2 3 4 8 7 6 5 ripple bootstrap vcc output cb nf input gnd
tba820m linear integrated circuit unisonic technologies co., ltd 2 www.unisonic.com.tw qw-r107-008.c ? absolute maximum ratings (t a =25 c) parameter symbol ratings unit supply voltage vcc 16 v output peak current i o(peak) 1.5 a power dissipation p d 1.25 w operating temperature t opr -20 ~ +85 c storage temperature t stg -40 ~ +150 c note:1. absolute maximum ratings are stress ratings only and functional device operation is not implied. the device could be damaged beyond absolute maximum ratings. 2. the device is guaranteed to meet performance specifications within 0 ~70 operating temperature range and assured by design from ?20 ~85 . ? electrical characteristics (t a =25 c, v cc =9v, f=1khz, r g =600 , r f =120 , r l =8 , unless otherwise specified. parameter symbol test conditions min typ max unit quiescent current i q v in =0 4 12 ma vcc=9v,r l =4 ,thd=10% 1.6 vcc=9v,r l =8 ,thd=10% 0.9 1.2 vcc=6v,r l =4 ,thd=10% 0.75 vcc=6v,r l =8 ,thd=10% 0.4 0.5 output power p out vcc=12v,r l =8 ,thd=10% 2 w total harmonic distortion thd p out =500mw 0.3 1 % open loop voltage gain gvo r f =0 75 db closed loop voltage gain gvc r f =120 33 36 39 db input resistance r in 5 m output noise voltage en r g =10k , bw(-3db)=50~20khz 0.3 1 mv
tba820m linear integrated circuit unisonic technologies co., ltd 3 www.unisonic.com.tw qw-r107-008.c ? test circuit utc tba820m 3 2 4 8 5 1 7 6 v cc r1 10k r f 120 r2 1 r l 4 r3 56 100 f/10v 100 f/16v cb (bootstrap cap) 47 f/10v 0.1 f input output 0.1 f 220 f/15v 100 f/15v
tba820m linear integrated circuit unisonic technologies co., ltd 4 www.unisonic.com.tw qw-r107-008.c ? typical characteristics fig 1 quienscent circuit current vs supply voltage fig 2 output power vs supply voltage fig 3 total harmonic distortion vs output power 4 0 8 12 16 20 0 4 8 v in =0 supply voltage(v) quiescent current(ma) 4 0 8 12 16 20 supply voltage(v) 0 0.4 0.8 1.6 2.0 1.2 output power(w) thd=10% f=1khz r f =120 r l =4 r l =8 r l =16 0 0.4 0.8 1.2 1.6 output power(w) total harmonic distortion ( %) 0 4 8 12 16 vcc=9v r l =8 r f =120 f=1khz 0 50 100 150 0 20 40 60 80 closed loop voltage gain(db) fig 4 voltage gain vs feedback resistance fig 5 power dissipation vs output power vcc=9v r l =8 f=1khz 00.40.81.21.6 output power(w) 2.0 power dissipation(w) 0 0.25 0.5 power dissipation(w) 0 0.5 1.0 0481216 supply voltage(v) 20 r l =16 r l =8 r l =4 fig 6 power dissipation vs supply voltage vcc=9v r l =8 f=1khz feedback resistance( )
tba820m linear integrated circuit unisonic technologies co., ltd 5 www.unisonic.com.tw qw-r107-008.c ? typical characteristics(cont.) total harminoc distortion(%) response(db) utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
|
